E.I. Physics Dep artment, Ben-Gurion University, Be er-Sheva 84105, Isr ael. This calculator was written by Aaron Robotham and Joseph Dunne in the programming language R, and uses the library Shiny to provide the interface. The X-ray and microwave observable-mass scaling relations of galaxy clusters are immensely valuable tools for cosmological analysis, but their power is currently limited by astrophysical systematic uncertainties that bias cluster mass estimates and introduce additional scatter. About. Title: Mass Variance from Archival X-ray Properties of Dark Energy Survey Year-1 Galaxy Clusters If this website is used to assist published work, please could you reference it by including a link to the front page. The functions are available as part of Aaron Robotham's R celestial package. The term cosmic variance is the statistical uncertainty inherent in observations of the universe at extreme distances. A variable speed of light (VSL) is a feature of a family of hypotheses stating that the speed of light in vacuum, usually denoted by c, may in some way not be constant, e.g. Title: Neutrino mass without cosmic variance. Guendelman. We use a set of Monte Carlo simulations of different homogeneous and inhomogeneous distributions to verify the relation and also test it in a set of cosmological N-body simulations. Scale In v ariance, Mass and Cosmology. Astrophysics > Cosmology and Nongalactic Astrophysics. It has three different but closely related meanings: It is sometimes used, incorrectly, to mean sample variance – the difference between different finite samples of the same parent population. Welcome to ICRAR's Cosmology Calculator! Cosmology with the cluster mass function 3 13 13.5 14 14.5 15 0 1000 2000 3000 4000 log M/M solar Number (>M) Spherical Triaxial 14 14.5 15 3900 4000 4100 4200 We relate the information entropy and the mass variance of any distribution in the regime of small fluctuations.